Three-dimensional nanoflower-like hierarchical array of multifunctional copper cobaltate electrode as efficient electrocatalyst for oxygen evolution reaction and energy storage application

A A Yadav; Y M Hunge; S B Kulkarni; Chiaki Terashima; Seok-Won Kang

doi:10.1016/j.jcis.2020.04.100

Three-dimensional nanoflower-like hierarchical array of multifunctional copper cobaltate electrode as efficient electrocatalyst for oxygen evolution reaction and energy storage application

J Colloid Interface Sci. 2020 Sep 15:576:476-485. doi: 10.1016/j.jcis.2020.04.100. Epub 2020 Apr 27.

Authors

A A Yadav¹, Y M Hunge², S B Kulkarni³, Chiaki Terashima², Seok-Won Kang⁴

Affiliations

¹ Department of Automotive Engineering, Yeungnam University, 280 Daehak-ro, Gyeongsan, Gyeongbuk 38541, Republic of Korea.
² Photocatalysis International Research Center, Tokyo University of Science, Yazamaki, Noda 278-8510, Chiba, Japan.
³ Department of Physics, The Institute of Science, 15 Madam Cama Road, Mumbai, 400032, India. Electronic address: sbk_physics@yahoo.com.
⁴ Department of Automotive Engineering, Yeungnam University, 280 Daehak-ro, Gyeongsan, Gyeongbuk 38541, Republic of Korea. Electronic address: swkang@yu.ac.kr.

PMID: 32485397
DOI: 10.1016/j.jcis.2020.04.100

Abstract

The study deals with the hydrothermal growth of a CuCo₂O₄ hierarchical 3D nanoflower-like array on carbon cloth (CuCo₂O₄@CC), which is a useful multifunctional electrode. The electrocatalytic oxygen evolution reaction (OER) study of the CuCo₂O₄@CC electrode shows high durability and good activity in 1 M KOH. As an energy storage electrode, it shows a high specific capacitance of 1438 Fg^-1 at 10 mA cm^-2 in a 3 M KOH electrolyte. The electrochemical stability of the CuCo₂O₄@CC electrode was tested for 5000 cycles at 10 mA cm^-2, and it showed 98.6% stability. This CuCo₂O₄@CC electrode produces a capacitance of 10 mA cm^-2 at an overpotential of 288 mV for the OER, with a Tafel slope of 64.2 mV dev^-1. The electrochemical stability measured at an overpotential of 292 mV for 12 h at 10 mA cm^-2 shows good electronic stability in an alkaline medium. The enhanced electrochemical performance of the CuCo₂O₄@CC electrode may be due to the Cu and Co counterparts in addition to the high surface area. The CuCo₂O₄@CC electrode is a simple, flexible, and cost-effectivive electrode in both electrocatalytic OER and energy storage applications.

Keywords: Carbon cloth; CuCo(2)O(4); Energy storage; Multifunctional; Oxygen evolution reaction.